Service manual

Page 18 of 64
4-2-2 No display(Image board)
1. Check software ver.
2. Check PIN short?
Check the supply of
Scaler and Osc. frequency
Chcek RESET signal，U21 Pin 6
=High level when power on.
The status of CPU
（U20）is right?
Check input
voltage is right?
Measure LVDS
input/output signal 号
X3 Osc. frequency
=14.318MHZ？
Repair the PANEL power
No display (Raster)
1.Check scaler (U20) input signal,
2.Check supply of scaler (U20).
1. Check the supply of
Deinterlace(U6), input,
output signal and Osc.
frequency.
2. Check the peripheral circuit
of De-interlace
1.Check the supply of Decoder 1、
2(U1,U16), Osc. Frequency,
input, output signal,
2.Check whether short.
Regarding the status to repair.
YES
NO
NO NO
YES YES
NO
YES
NO
YES
NO
YES